Benchmark Practice - Element Compound Mixture

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What is a pure substance?

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A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

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What is an element?

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An element is a pure substance that cannot be broken down into simpler substances by chemical means. Examples include oxygen (O) and gold (Au).

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What is a compound?

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A compound is a pure substance formed when two or more elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

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What is a mixture?

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A mixture is a combination of two or more substances that are not chemically bonded. The individual components retain their own properties. Examples include air and salad.

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How are elements and compounds similar?

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Both elements and compounds are pure substances.

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What is the periodic table?

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The periodic table is a tabular arrangement of elements, organized by increasing atomic number, which shows the relationships between them.

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What is the difference between a pure substance and a mixture?

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A pure substance has a uniform and definite composition, while a mixture contains two or more substances that retain their individual properties.

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Can compounds be broken down?

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Yes, compounds can be broken down into their constituent elements through chemical reactions.

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What is an example of a mixture?

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An example of a mixture is brass, which is made from zinc and copper.

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What is a homogeneous mixture?

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A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.